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LTRIM function is used to remove leading spaces from a string. In your case, it is not spaces, but leading zeros that you need to remove. And LTRIM() function takes only one argument (that is the string that you want to trim). That is why you are getting
the error.

One simple method that can be applied here is to convert the value to INT (which discards the leading zeros) and then convert back to string. See this example.